<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>主页</title>
    <style>
        #head{
            width: 800px;
            height: 500px;
            border: 2px solid black;
            margin: 50px auto;
        }

    </style>
</head>
<body>


<div id="head">

</div>

</body>
</html>